ORTHOPTERA OF INDIANA. # 431 



Mr. Scudder, in two recent papers,* has in part straightened out 

 this difficulty. However, he, as well as the European writers, has 

 written mainly of specimens collected hy others, and has not studied 

 the insects in the field. For this reason Mr. Scudder has stated that but 

 three species occur in the northern and central United States, east 

 of the Mississippi Eiver. A long series of observations in the field, 

 coupled with a careful examination of a large number of individuals, 

 has convinced me that at least six species occur in Indiana, f Of 

 these, two are believed to be undescribed. The following key, based 

 largely on the females, may be used in their separation: 



KEY TO INDIANA SPECIES OF GEYLLUS. 



a. Black species, the tegmina and parts of the body sometimes dull 

 reddish brown; first joint of antennre not projecting beyond front 

 of head. (Field crickets.) 



h. Very large species, about 25 mm. long; the hind margin of pro- 

 notum convex; hind tibiae with seven to eight spines on each 



side 132 firmns, p. 432 



hh. Medium or small-sized species, the body seldom exceeding 20 

 mm. in length; hind margin of pronotum truncate; hind tibise 

 with five to six spines on each side. 



c. Ovipositor but little, if any, longer than hind femora, 

 never more than 12 mm. in length; tegmina of female 

 with only their basal halves overlapping or attingent, 

 the apical halves spread apart so as to leave a wide V- 



shaped notch between them 133 mnericanus, p. 433 



CO. Ovipositor plainly longer than the hind femora, always 

 13 or more mm. in length; tegmina of female with their 

 inner edges either overlapping or attingent their full 

 length. 



d. Body slender; the pronotum never more than 5 mm. 

 in width; the tegmina, cerci, ovipositor and legs 



reddish brown in color 134 arenaceus, p. 434 



(Id. Heavy bodied species; the pronotum always more 



than 6 mm. in width; the tegmina, cerci, ovipositor 



and tibia? black; the hind femora often with the 



basal half of the under side reddish brown. 



e. Ovipositor nearly or fully half as long again as 



hind femora, always exceeding 18 mm. in 



length; the male stout, with large and broad 



head 135 abbreviatus, p. 435 



'■■"The Species of GryUus on the Pacific Coast,"— Psyche, IX, 1901, 267, et $eq., and "The 

 Species of Gryllus found in the United States East of the Sierra Nevadas,"— Psyche, IX, 

 1902, 291, et seq. 



t Including G. Annua Scudder, of which, however, I have seen no specimen from this 

 State. 



